Concrete cylinder form slitting machine



March 3, 1959 R. B. FLEMING 2,875,328

CONCRETECYLINDER FORM SLITTING MACHINE Filed Jan. 26, 1955 v INVZINTOR.

Richard B. F lemims iPZ/JQQ AT TOR NE CONCRETE CYLINDER FORM SLITTING MACHINE Richard B. Fleming, Brooklyn, Y. n 4 Application January 26,- 1955, Serial No. 484,266

1 Claim. (Cl. 164-77) This invention relates to improvements in devices for releasing moulded concrete cylinders and other shapes from' confinement in cylindrical sheet forms and other similar molds.

- it out, and manual or machine operated traversingime'ans for advancing the cutting means along the cutting path.

A further object of the invention is to provide a novel and improved concrete cylinder stripping machine in which the cutting means is so arranged as to exert only suflicient cutting effort to cut the encasement of the concrete cylin-- der, without scoring or otherwise damaging or injuring the cylinder itself.

Still another object of the invention is to provide a novel and improved concrete form stripping machine in which the form to be stripped is readily receivable'in the main housing, for the stripping operation, and wherein, after the encasement is stripped from the form, or mold,

V United States Patent the cylinder is readily moved out of the housing without the need for actual lifting of the concrete cylinder, and without damage thereto.

Still a further object of the invention is to provide a novel and improved concrete form stripping machine in whichthe entire construction is simple in design, includes a minimum of parts, and is highly effective in operation, permitting at low cost, the continuous successive stripping of a large number of concrete cylinders for test or other purposes, with the utmost in convenience to the operator of the machine.

' These and other objects and advantages of the invention will become apparent from the following description of 1 a; preferred embodiment thereof, as illustrated in the accompanying drawings, forming a part hereof, and in which,

Figure 1 is a front elevational view of the machine, with a concrete cylinder disposed therein in, partly cut disposition. t A V Figure 2 is a right end elevational view of the machine shown in Figure 1.

' Figure 3 is a top plan view of the device shown in Figure l. j

Figure 4 is a longitudinal sectional .elevational view taken substantially on plane 4--4 of Figure 3.

Figure 5 is atransverse sectional elevational detail view taken substantially on plane 5-5 of Figure 3, and showing only the parts at the planar viewing line.

.In connection with moldedor cast products, such as cement or concrete cylinders and other shapes, it is 'frequently necessary or important" to remove or strip from the molded cylinder the encasement, which maybe in r 2,875,828 Patented Mar. -3, 195.9

"icethe form of a paperboard or cardboard hollow cylinder or the like, conforming to the curvature of the molded shape. Where such molded products are formed in large numbers, as'for use as posts, supports, or the like, or as test samples for use in testing machines to determine the physical strength and deformation characteristics of the molded concrete, it is apparent that stripping each mold individually by hand is difiicult and time consuming. The present device provides novel means for achieving the stripping of the confining encasement or mold form from the molded concrete cylinder 01' the like, with remarkable rapidity, and without damage to the concrete itself.

In order to understand clearly the nature of the invention, and the best means for carrying it out, reference may now be had to the drawings, in whichlike numerals denote similar parts throughout the several views. 7

As shown, there is a main base generally indicated at 10, and including a base floor 12, with upstanding first and second side flanges or walls 14 and 16, which may be integral with the base floor 12, as for example, in the shape of a channel structural member or the like. The device includes first and second side walls 18 and 20, the lower edges 22 of which are preferably seated upon the web 12 of the main base or channel 10, so that the lower portions of the front and rear edges 24 and 26 are seated firmly against the upstanding flanges 14 and 16 of the base channel 10, and preferably firmly secured or even welded thereto, so as to attain substantial rigidity and strength against deformation in use. As seen best in Figure 2, the upper portions of the end walls 18 and 20 may be upwardly divergent to attain the necessary width of the said Walls at their upper portions, to accommodate the shafts shown, as at 30 and 32. It is thus seen from the views, that the shafts 30 and 32 have their outer ends extending in reduced form through the accommodating openings formed through the upper ends of the side walls 18 and 20, being secured to said walls by suitable fastening means, such as nuts 34 threaded onto the ends of the slide shafts 30 and 32.

A gear rack 40, having teeth 42formed all along its lower'surface, as seen best in Figures 1 and 4, is secured by screws or bolts 44 to the undersurfaces of supporting web walls 46, the webs 46 being in turn either welded or otherwise secured to or integrated with slide sleeves 48, which are of slightly greater inside diameter than the diameters of the slide shafts 30 and 32, and thus are able to slide freely along the slide shafts from left to right and vice versa, as seen in Figures 1, 4, and 3. Thus the rack 40, the web walls 46, and the slide sleeves 48 all are secured together in this manner as a unit, for movement together in a direction parallel to the axes of the shafts 30 and 32.

A pair of shaft supporting walls 50 and 52 are secured by screws or bolts 54 to the outer surfaces of the base channel flanges 14 and 16, and are'preferably made of substantial thickness to avoid deformation or deflection under the stresses normally encountered thereby. The shaft supporting walls 50 and 52 are thus disposed preferably intermediate the end walls 18 and 20, and, as seen in Figure 3, are outwardly of the slide shafts 30 and 32, and thus out of the paths of movement of the slide sleeves or hollow hubs 48. Bearing bores 56 are formed through the bracket walls 50 and 52, to receive 1 the turning shaft 58, and as shown, there is a gear or pinion 60. mounted on the shaft 58 for turning therewith, being secured by set screws 62 or the like threaded radially into the reduced gear sleeves 64 which are integral with the pinion 60, so as to ttu-n with the shaft 58.

The teeth of the gear 60 being in mesh with the: teeth on the rack 40, it is seen that turning the gear 60 results in longitudinal movement of the rack to the left or right depending upon -gear--60. "A'retaining'sleeve66'is secured on one end of the shaft 58 by means of a set screw or the like, and a handle receiving hub..68, having an extended hub sleeve 701rntegralitherewith,is mounted on "the other endfof fthetshaftSS, "beingsecure'd thereto for tu'rning'with the nha'ftbytmeans of a set screw 72. Thehan'dle receiving hub-'6 8 has' an opening'74 formed therethroughtoreceive the jsh'ank "76 "of the "handle 78, the position of the v shank 76 being'adjustable by loosening and tightening the f setjscrew'79'asneeded. "A handle, grip 80 is carried on the outer. or distal 'end of the handle shank, being turn- :ableon ahandlefgrippin 82 one end of which is threaded mtoor otherwise secured in an opening formed in the outer "end "of the handle shank 76.

It'is thus apparent that turning the handle 78 in a clockwise direction .as seen inFigures 1 and 4, turns the 2111101160, and .hence moves thegear rack 40 to the r1ght,"whi1e.turning it in the counterclockwise direction retracts the gear rack to'the left. An opening is formed at :88inwall 18 to allow the left end of the rack 40 to extend freely Ltherethrough when in extreme retracted position; A cutting orslittingwheel 90 having suitably sharpened cutting edge, is mounted on a small shaft or pin92 extending acrossth'e opening in the space between the bifurcations 96 of the' yoke-.94, theyoke beingsecured to or carried by the yoke supporting shaft 98, whichds "preferably rectangular in cross section and extends through l8. correspondingly shaped opening 99 in the floor 101 of thehousing '100. As seen best in'Figure 5, the housing 100 is mounted on the right hand or forward end of 'the' rack 40,'by suitable means, suchas the .angle bracket 103, and may .befforme'd' in complementary housing'halve's'105 an'd107 secured together by screws I28 'orthe like. I

As seen in'Figure '5,.the rectangular post 98 may have apiston hea'd'106 secured to its upper end, withv a spring 110 disposed'thereabove to .exertijdownward cutting bias on the cutting or slitting wheel. 90 under compression governed' bytthe washer'130carriedby and movable with the lower end of the threaded compression adjusting screw 116. The screw'11'6 is threaded through an opening 122 in the top wall 1120f the housing 100, which is secured in any suitable manner to the housing, as by screws114. A'turningaknob or handle 118 is mounted on the-upper end of the adjustment screw '116 by means of a screw 120, toturn thescrew 116.

The dew'ce shown.is ,particularly useful in slitting the encasing cardboard or fibreboard covering 132 from a concrete or cement or other composition cylinder or other shape, such as shown at 134. The encased concrete cylinder .134 is placed in the machine, soas to-rest upon the web or floor 12, with its right end against and in contactwith the supporting stop member 140, .as seen clearly'in Figures 3 and 4. 'The flange 16 is partially cut away, as seen in Figure 4, to the right of location 142, and the cut extends almost to the end wall 20, thus allowing ready insertion of the cylinder to be stripped, and removal thereof when the slitting operation is completed, through this opening. A small rib stop member or inner positioning wall 138 is disposed as seen best in Figure '5, on the sameside as the-cut away opening in the flange 16, to furnish some support for the concrete cylinder while being stripped, but'it is seen that it is simple to roll the stripped cylinder over this stop 138 when the slitting is finished, to the right as seen in Figure 5.

An opening152 is formed inthe right end wall 20, as seen best in Figures 2 and 4, to allow the .right end of the rack) andthe housing 100 to move therethrough without obstruction. By adjusting the handwheel 118, it is seen that the slitting or cutting pressure on the waxed cardboard cylinder 132 may be adjusted just to be enough to slit .the same, avoiding damage to the concrete cylinder -therebelow. 'lfadesire'ita suitable stop the direction of turning of the limit means may be provided to block movement of "the cutting edge of wheel below a predeterminedlevl,

depending upon the thickness of the casing 132.

It is thus seen that this is a very versatile instrument for its intended purpose. By mere manipulation of the cutting wheel handle 78 traverse of the cutting wheel is made quickly and easily,-so that a large number of such cylinders may be stripped uniformly and within a short time. By adjustment .of the dimensions, .a variety of sizes of cylinders or other'molds may be stripped.

Although I have described my invention in specific terms, it will be understood that various changes may be made in size, shape, materials andarrangementwithout departing from the spirit and scope of the invention as claimed.

I claim:

A device for stripping a form from a concretelike form-encased mold, comprising a main base means in the ;form of-a;channel having edge flanges upturned to define a trough-for receiving said concrete-like .formencased'mold, first andsecond end walls extending upwardly from said main base means in mutuallyspaced relationship to define saidtrough to receive saidform-en- .cased mold, inner positioning wall means carried by-said channel intermediate said edgeiflanges forprecise positioning of said moldto bring its'axis into strippingposition, bracket wallmeans disposed intermediate said .first andsecond end'wa'lls, pinion shaft means carried by said bracketwall means for rotation about the axis of said pinion shaftmeans, a piniongear carriedby said pinion shaft means for turning .therewith, overhead.rail means formed of a pair of cylindrical shafts interconnecting said int .and second end walls, ifirst and second -web meansslidably engaging said pair of shafts inlmutually spaced relationship for slidable .movement therealong, a rack secured-to both said web means intermediate .said pair of shafts for .slidablemovement therealong-with saidweb means,:said web means comprisinghollow hub means for slidably receiving said shafts :for saidfslidable engagement, said rack being in engagement with said pinion gear, .so that said rack islongitudinally :moved .on turning of said pinion gear, crank meansfor turning said pinion shaft means, a cutting wheel head carried -'by said rack for movementtherewith, and comprising a cutting head housing defining a .bore, a cutting wheelsupporting shaft engaging .said bore, yoke means on the lower portion of said shaft for carrying a .form cutter wheel, for cutting said encasing :form, resilient means acting between said cuttinghead housing and said cutting'wheelsupporting shaft for exerting cutting bias on said shaft :and said cutting wheel, and adjustment means :including a :threaded adjustment handwheeland shaft forregulating thexdegree of resilient bias, a cutting wheel :means carried by said cutting wheel supporting shaft and oriented downwardly therefrom for slitting engagement with said form to be stripped from said mold, said first and second end walls having openings formed therein through which said rack and cutting wheel isextensible,'whereby'full retraction and extension of said rack is possible, and so that on retraction of said rack, said mold is upwardly accessible.

References Cited in the file of this patent UNITED STATES PATENTS 

